Thor's gaze turns skyward at the same time as Tony's does, and in his foggy-headiness, he doesn't realize what Tony is doing until the seal is nearly finished.

He looks at Tony uncomprehendingly, a single hand groping blindly where the gaping hole should be, but isn't.

"Tony -- what?"

He looks down at Tony, at the wound still in his chest. In an instant, Thor's hands are upon it; he presses his hands against the wound, trying to stem the tide. He'd been prepared to see Tony die moments before, but now --

"Do it," he snaps at him. "Do whatever you did to me to yourself!"